Very large mode slab-coupled optical waveguide laser and amplifier

Abstract

A very large mode (VLM) slab-coupled optical waveguide laser (SCOWL) is provided that includes an upper waveguide region as part of the waveguide for guiding the laser mode. The upper waveguide region is positioned in the interior regions of the VLM SCOWL. A lower waveguide region also is part of the waveguide that guides the laser mode. The lower waveguide region is positioned in an area underneath the upper waveguide region. An active region is positioned between the upper waveguide region and the lower waveguide region. The active region is arranged so etching into the VLM SCOWL is permitted to define one or more ridge structures leaving the active region unetched. One or more mode control barrier layers are positioned between said upper waveguide region and said lower waveguide region. The one or more mode control barrier layers control the fundamental mode profile and prevent mode collapse of the laser mode. The mode control barrier layers also block carrier leakage from the active region. These layers are essential to obtaining VLM SCOWLs.

Description

SPONSORSHIP INFORMATION[0001]This invention was made with government support awarded by DARPA / MTO under Grant No. FA8721-05-C-0002. The government has certain rights in the invention.BACKGROUND OF THE INVENTION[0002]The invention is related to the field of slab-coupled optical waveguide lasers (SCOWL), and in particular to a very large mode SCOWL.[0003]High power, single spatial mode diode lasers are important for a number of applications, including pumps for fiber lasers and amplifiers and free space optical communications. The power in a single mode is limited by the size of the single-spatial mode in the diode laser.[0004]The state of the art in large spatial mode diode lasers is the SCOWL. A SCOWL device lasing at a wavelength of 1.0 μm designed with a waveguide thickness of 5 μm has been demonstrated to have a stable single spatial mode with dimensions of 5.7 μm (horizontal direction) by 4.5 μm (vertical direction), where these dimensions are given as full width at 1 / e2 intensi...

AI Technical Summary

Benefits of technology

The invention provides a very large mode (VLM) slab-coupled optical waveguide laser (SCOWL) and a method for its fabrication. The SCOWL has an upper waveguide region, a lower waveguide region, and an active region between them. The active region is unetched during fabrication. The SCOWL also has one or more mode control barrier layers to control the profile of the fundamental mode, prevent mode collapse, and block carrier leakage from the active region. The technical effects of this invention include improved laser performance and stability.

Problems solved by technology

The power in a single mode is limited by the size of the single-spatial mode in the diode laser.

This is because the maximum power density at the facet is approximately constant, and is limited by effects such as catastrophic optical damage and thermal roll-over.

However, with this simple approach, one finds that it is extremely difficult to filter out higher order modes, since the higher order modes become more numerous as the waveguide dimensions increase and the propagation constants of the higher order modes also become more closely spaced.

In addition, it becomes more difficult to provide sufficient gain to the fundamental mode, while controlling its mode profile.

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